Anxiety in a relationship

Hello, I’m writing this to see if others have similar experiences.
I’ve noticed I get into an anxiety ridden spiral when my boyfriend doesn’t text me through most of the day and if he leaves me on delivered or seen for very long. We are very early into our relationship and we were friends for years before we started dating. We mostly talk through instagram and see each other when we are able to. But I’ve noticed I get very sad and lonely when he doesn’t send me stuff all day or replies late. I know people are busy and he recently started college so ya know he’s a busy bee. But every time I try to think realistically, my mind tells me that he’s losing interest in me and that I’m bothering him.
Soooo since I don’t want to bother him I don’t send him anything, but then that makes me feel bad. And then when he doesn’t send anything at all I go crazy.

I’ve always had bad anxiety but this truly drives me insane. Has anyone else experienced this before? And if so what helps you calm down? Thank you.